feat: standalone web UI (React + Vite)

React + TypeScript UI on port 5274. Connects to local daemon via
WebSocket IPC (DaemonAdapter). Full chat layout with sidebar, message
pane, and peer list. Mirrors the TUI feature set.

- src/types.ts        — IPC types mirroring proto.go
- src/adapter/daemon  — WebSocket IPC adapter with auto-reconnect
- src/store/index.ts  — Zustand store; handles all daemon events
- src/pages/          — Onboarding (connect + join) and Chat
- src/components/     — Sidebar, MessagePane, PeerList

Dev: cd web && npm run dev  (port 5274)
Build: cd web && npm run build

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/App.tsx

@@ -0,0 +1,22 @@
+import { useEffect } from 'react'
+import { useWaste } from './store'
+import { Onboarding } from './pages/Onboarding'
+import { Chat } from './pages/Chat'
+import './App.css'
+
+// Default to local daemon WS IPC. Override with VITE_DAEMON_WS env var.
+const DAEMON_WS = import.meta.env.VITE_DAEMON_WS ?? 'ws://127.0.0.1:17338'
+
+export default function App() {
+  const { connect, daemonStatus, localPeer } = useWaste()
+
+  useEffect(() => {
+    connect(DAEMON_WS)
+  }, [connect])
+
+  if (daemonStatus !== 'connected' || !localPeer) {
+    return <Onboarding status={daemonStatus} />
+  }
+
+  return <Chat />
+}